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| Ordering number:EN4091 Monolithic Linear IC LA7285, 7285M VCR Audio Signal Recording and Playback Processor Overview The LA7285 and LA7285M include on chip all functions required for the record and playback of VCR audio signals. In addition, the inclusion of a switching circuit for switching between tuner and line input in addition to the circuits provided by earlier ICs makes the LA7285 truly optimal for audio VCR products. Package Dimensions unit:mm 3067-DIP24S [LA7285] Funtions * * * * * * * * * * Equalizer amplifier Line amplifier Recording/playback switch Recording amplifier Mute SP, LP, EP switch Ripple filter ALC Tape head switch Line/tuner input switch SANYO:DIP24S unit:mm 3112-MFP24S [LA7285M] Features * Built-in input switching circuit (for the line and tuner inputs). * Smaller package leaves large space for other components. * Equalizer input/output capacitors not required. * Low gain variation eliminates the need for external ajustment. * Supply voltage : 9V and 12V operation. Specifications Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Pin1 input voltage Pin1 input current Allowable power dissipation Operating temperature Storage temperatrure Symbol VCCmax VIN1 VIN1 Pd max Topr Tstg DC Conditions SANYO:MFP24S Ratings 14 +65 1.5 400 -10 to +65 -55 to +150 Unit V Vp-p mA mW Ta65C C C Operating Conditions at Ta=25C Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCCop Conditions Ratings 12 8.5 to 12.75 Unit V V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquaters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 53098HA (KT) No.4091-1/7 LA7285, 7285M Operating Characteristics at Ta=25C, VCC=12V, f=1kHz, 0dBV : 1.0 Vrms Parameter Current consumption (EE) Current consumption (PB) Current consumption (REC) [Equalizer amplifier] Open-circuit voltage gain Equivalent input noise voltage [Line amplifier] Voltage gain (PB input) Voltage gain (EE, LINE input) Total harmonic distortion Output noise voltage Maximum output voltage Output voltage when ALC is on ALC effect Distortion when ALC is on [Recording amplifier] Voltage gain (open) Voltage gain (colse) Total harmonic distortion Maximum output voltage [Mute circuit] On voltage Off voltage Mute attenuation (PB,EE) Mute attenuation (REC) [EP, LP, SP switch circuit] EP mode hold voltage LP mode hold voltage SP mode hold voltage [Line/Tuner PB switch circuit] Line mode hold voltage Tuner mode hold voltage PB mode hold voltage [REC, EE switch circuit] REC mode hold voltage EE mode hold voltage [Head Select Switch] Pin 1 on resistance Pin 2 on resistance Pin 2 input voltage RON1 RON2 VIN1 I1=1mA I2=1mA 20 5 30 10 45 V VRR VRE Pin 24 DC voltage Pin 24 DC voltage 3 0 VCC 1.0 V V VLL VLT VLP Pin 22 DC voltage Pin 22 DC voltage Pin 22 DC voltage 3.6 1.8 0 6.0 2.6 1.0 V V V VEE VEL VES Pin 21 DC voltage Pin 21 DC voltage Pin 21 DC voltage 3.6 1.8 0 6.0 2.6 1.0 V V V VMON VMOFF MP,ME MR Pin 23 DC voltage Pin 23 DC voltage 2.5 0 80 65 90 75 6.0 1.5 V V dB dB VGOR VGOR THDR VOMR VO=-7dBV VO=-7dBV VO=-7dBV THD=1% 47.0 12.5 1.5 52.0 13.0 0.1 2.0 13.5 0.3 dB dB % Vrms VGLP VGLE, VGLL THDL VNOL VOML VOA ALC THDA VO=-7dBV VO=-7dBV VO=-7dBV Rg=2.2k, DIN Audio filter THD=1% VIN=-27dBV VIN=-27dBV to -7dBV VIN=-27dBV 1.5 -8.0 21.0 21.0 21.5 21.5 0.05 -72 2.1 -7.0 1.0 0.05 -6.0 3.0 0.6 22.0 22.0 0.3 -66 dB dB % dBV Vrms dBV dB % VGOE VNIE VO=-7dBV Rg=2.2k, DIN Audio filter 66.0 71.0 1.2 1.8 dB Vrms Symbol ICCE ICCP ICCR No signal No signal No signal Conditions Ratings min 9.5 9.5 8.0 typ 13.0 13.0 11.0 max 16.5 16.5 14.0 Unit mA mA mA Ta=65C, f=80kHz (sin), ILK=10A No.4091-2/7 LA7285, 7285M Block Diagram Test Circuit Unit (resistance:, capacitance:F) No.4091-3/7 LA7285, 7285M Switch Operation Table Test item (symbol) ICCE ICCP ICCR VGOE VNIE VGLP, THDL, VOML VGLE, VGLL VNOL VOA, ALC, THDA VGOR VGOR, THDR, VOMR MP MR ME SW1 2 2 2 1 2 2 2 2 2 2 2 1 2 2 SW2 1 1 1 2 1 1 1 1 1 1 1 1 1 1 SW3 1 1 1 3 3 2 1 3 3 3 3 1 1 3 SW4 2 2 2 2 2 2 2 2 1 2 2 2 2 2 SW5 1 1 1 1 1 1 1 1 1 2 1 1 1 1 VM GND GND GND GND GND GND GND GND GND GND GND 5V 5V 5V VL 5V GND 5V GND GND GND 2.5V, 5V 5V 2.5V, 5V 5V 5V GND 5V 5V VR GND GND 5V GND GND GND GND GND GND GND GND GND GND GND Input - - - VIN1 - VIN2 VIN3, VIN4 - VIN3, VIN4 VIN5 VIN5 VIN1 VIN5 VIN2 Measure A A A VO1 VO1 VO2 VO2 VO2 VO2 VO3 VO3 VO2 VO3 VO2 Sample Application Circuit Unit (resistance:, capacitance:F) No.4091-4/7 LA7285, 7285M Pin Function Pin No. 1 Function name Head switch1 (high withstand voltage) Unit (resistance:) Internal circuit for pin Description of function EE, PB off, REC off On resistance 20(typ) Withstand voltage when off 45V (f=80kHz) 2 EQ AMP input and Head switch2 Input impendance for playback signal input from head 80k (typ) EE, REC on PB off On resistance 5 (typ) 3 GND GND for pin 1 head switch and Equalizer Amplifier only Use to change tape heads and resonant frequency. On resistance 15 (typ) Input impendance 10k (typ) (EP mode) Switches the Playback Equalizer Amplifier high-region frequency voltage gain. On resitatance 15k (typ) Input impedance 10k (typ) (EP mode) 4 EP mode switch1 5 EP mode switch2 6 EQ AMP NFB Equalizer Amplifier negative feedback pin 7 EQ AMP output 8 LINE AMP PB input Internal reference Inputs the playback signal from the Equalizer Amplifier. Because the input impedance is as high as 110K, a 0.1F ceramic capacitor can be used for the coupling capacitor on pin 8. 9 ALC FILTER Wave detection is performed when connected to GND through a capacitor. In addition, the attack and recovery time is set by C and R time constants. Inputs EE and REC signals. Internal reference 10 TUNER input The reference input is set by resistors R1 and R2. The amplifier gain is fixed at 21.5dB. In addition, because the input impedance is as high as 110k, a 0.1F ceramic capacitor can be used for the coupling capacitor on pin 10. GND for all circuit blocks except the head switch and Equalizer Amplifier. 11 GND Continued to next page. No.4091-5/7 LA7285, 7285M Continued from proceeding page. Pin No. Function name Unit (resistance:) Internal circuit for pin Description of function Inputs EE and RE signals. 12 LINE input Internal reference The reference input is set by resistors R1 and R2.The amplifier gain is fixed at 21.5 dB. In addition, because the input impedance is as high as 110k, a 0.1F ceramic capacitor can be used for the coupling capacitor on pin 12. 13 ALC input wave detection Inputs the Line Amplifier output signal. The ALC level is set by the resistors R1 and R2. 14 LINE AMP output Output inpedance 50 (typ) Inputs the recording signal from Line Amplifier. 15 REC AMP input The recording current is set by the resistors R1 and R2. A coupling capacitor is unnecessary as pin 15 is a zero baias input. Used to adjust the high-region peaking frequency during recording amplifier in LP mode. On resistance 15 (typ) Intput inpedance 50 (typ) 16 LP mode switch 17 REC AMP NFB Recording amplifier negativefeedback input. Used to adjust the high-region peaking frequency of the recording amplifier with an L, C, R network connected to ground. 18 REC AMP output Output inpedance 40 (typ) 19 Ripple filter Power supply of each circuit block Ripple rejection is performed when connected to GND through an electrolytic capacitor for the filter. 20 Supply voltage (VCC) VCC max=14V VCC=8.5V to 12.75V When the voltage on pin 21 is 3.6V to 6.0V:EP; when 1.8V to 2.6V:LP; when 0V to 1.8V:SP Switch On Pin Number EP mode:4,5,16 LP mode:16 21 EP/LP/SP Control Continued to next page. No.4091-6/7 LA7285, 7285M Continued from proceeding page. Pin No. Function name Unit (resistance:) Internal circuit for pin Description of function 22 LINE/TUNER/PB Control When the voltage on pin 22 is 3.6V to 6.0V:LINE; when 1.8V to 2.6V:TUNER when 0V to 1.0V:PB 23 MUTE Control When the voltage on pin 23 is 2.5V to 6.0V:MUTE on; when 0V to 1.5V:MUTE off 24 REC/EE Control When the voltage on pin 24 is 2.5V to VCC:REC; when 0V to 1.0V:EE No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibilty for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of May, 1998. Specifications and information herein are subject to change without notice. PS No.4091-7/7 |
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